Disposal of undelivered mail

§ 4105. Disposal of undelivered mail (a) Undelivered mail, other than letters and parcels of the first class, may be— (1) disposed of as the Postmaster General directs; or (2) forwarded to the addressee or returned to the sender. The postage for the service may be prepaid or collected on delivery in accordance with the instructions and pledge of the addressee or sender. (b) The Postmaster General may prescribe conditions under which mail covered by subsection (a), including mail which is of an urgent or perishable nature, and for which payment of forwarding or return postage is not pledged, may be forwarded or returned. (c) The Postmaster General may sell undelivered parcels containing perishable matter, not forwarded or returned. He shall remit to the sender or rightful owner the amount realized, less a commission of 10 per centum, or 25 cents, whichever is the greater.